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Employee Benefit Plans (Expected Benefit Payments) (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, expected benefit payments, 2021 $ 39
Defined benefit plan, expected benefit payments, 2022 45
Defined benefit plan, expected benefit payments, 2023 43
Defined benefit plan, expected benefit payments, 2024 45
Defined benefit plan, expected benefit payments, 2025 44
Defined benefit plan, expected benefit payments, 2026-2030 201
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, expected benefit payments, 2021 11
Defined benefit plan, expected benefit payments, 2022 11
Defined benefit plan, expected benefit payments, 2023 11
Defined benefit plan, expected benefit payments, 2024 11
Defined benefit plan, expected benefit payments, 2025 11
Defined benefit plan, expected benefit payments, 2026-2030 $ 55